Bug#756777: Dirac FTBFS on armhf and blocks migration of arm64 fix.

[peter green]

Found 756777 1.0.2-6
Thanks
> | Checking encode and decode of colourbars
> |
> |   2: colourbars                                      FAILED (colourbars.at:7)
> |
>   
I've just reproduced this locally with both sid's version in sid and 
jessie's version in jessie. So this doesn't appear to be related to the 
change in the sid package but related to some change in the build 
environment. If I had to guess i'd say a computer

A testsuite log is attatched but isn've massively informative. It just 
says the encoder segfaulted I got a backtrace but without any idea of 
how the code works I'm not sure what to check for next.

> root at odroidu2:/dirac-1.0.2# gdb -ex=r --args  encoder/dirac_encoder 
> -cformat YUV420P -SD576I50 -qf 7 -num_L1 0 -local 
> tests/colourbars_420.yuv ../../colourbars_420_enc.drc
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> Reading symbols from encoder/dirac_encoder...done.
> Starting program: /dirac-1.0.2/encoder/dirac_encoder -cformat YUV420P 
> -SD576I50 -qf 7 -num_L1 0 -local tests/colourbars_420.yuv 
> ../../colourbars_420_enc.drc
>
> Program received signal SIGSEGV, Segmentation fault.
> dirac::PictureCompressor::SelectQuantisers (this=this at entry=0x207ccec, 
> coeff_data=..., bands=..., lambda=lambda at entry=6.25, est_bits=..., 
> cb_mode=QUANT_SINGLE, pp=..., csort=csort at entry=dirac::Y_COMP)
>     at picture_compress.cpp:632
> 632                 est_bits[b] = SelectMultiQuants( coeff_data , 
> bands , b, lambda,
> (gdb) bt
> #0  dirac::PictureCompressor::SelectQuantisers 
> (this=this at entry=0x207ccec, coeff_data=..., bands=..., 
> lambda=lambda at entry=6.25, est_bits=..., cb_mode=QUANT_SINGLE, pp=..., 
> csort=csort at entry=dirac::Y_COMP)
>     at picture_compress.cpp:632
> #1  0x00036d94 in dirac::PictureCompressor::CodeResidue 
> (this=this at entry=0x207ccec, my_buffer=..., pnum=<optimized out>, 
> p_picture_byteio=p_picture_byteio at entry=0x20e4af0) at 
> picture_compress.cpp:449
> #2  0x000232ee in dirac::SequenceCompressor::CompressNextPicture 
> (this=0x207cbd0) at seq_compress.cpp:447
> #3  0x00018e72 in DiracEncoder::CompressNextPicture 
> (this=this at entry=0x207c400) at dirac_encoder.cpp:607
> #4  0x0001b122 in CompressNextPicture (this=0x207c400) at 
> dirac_encoder.cpp:1141
> #5  dirac_encoder_output (encoder=0x207c240) at dirac_encoder.cpp:1106
> #6  0x00014b20 in main (argc=<optimized out>, argv=<optimized out>) at 
> encmain.cpp:1234
> (gdb)
Disabling optimisation makes the package build but obviously that isn't 
a very good soloution.

This build failure is blocking the migration of the arm64 patch for 
dirac (which is depended on by gstreamer) to testing.